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uncountable
(now rare, archaic) A type of punch made chiefly from rum; grog. quotations
Your worship would have seen him before now; for, when he is well, he and my good master Hatchway come hither every evening, and drink a couple of canns of rumbo apiece […] .
1751, [Tobias] Smollett, The Adventures of Peregrine Pickle […], volumes (please specify |volume=I to IV), London: Harrison and Co., […]
Will you have a can of flip, or a jorum of hot rumbo?
1824 June, [Walter Scott], Redgauntlet, […], volumes (please specify |volume=I to III), Edinburgh: […] [James Ballantyne and Co.] for Archibald Constable and Co.; London: Hurst, Robinson, and Co.